Connecting the Ephemeris of the Geminga Pulsar to GLAST

The Geminga pulsar is unique among gammaray pulsars in having a precise andcontinuous, phaseconnected ephemeris from 1973 up to the present. Since thedemise of the Compton GammaRay Observatory in June 2000, the only practicalmethod of maintaining Geminga.s ephemeris has been with Xray observations. Ourcontinuing XMM ephemeris has made possible several groundbased searches forpulsations, from radio to very high energy gammarays. This is the final requestfor our XMM program on Geminga in order to make a precise phase connection withGLAST, which will be launched in 2008 and will continue the ephemeristhereafter. (We thought that this program would be finished in AO6 but thelaunch of GLAST was delayed, necessitating this additional proposal.) truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]